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USER MANUAL
BIOS Setting
Legacy USB Support User can enable or
EMCI Hand‐off
USB mass storage
driver support
USB Transfer time‐
out
Device Reset time‐
out
Device power‐up
delay
ID31 MOTHERBOARD
CHAPTER 4
Description
disable USB port.
This is a
workaround for OSs
without ECHI hand‐
off support.
User can Enable or
disable USB mass
storage driver
support.
The time‐out value
for control, bulk,
and interrupt
transfers.
USB mass storage
device start unit
command time‐
out.
Maximum time the
device will take
before it properly
reports itself to the
host controller.
Setting Option
Disable
Enable
Disable
Enable
Disable
Enable
1 Sec
5 Sec
10 Sec
20 Sec
10 Sec
20 Sec
30 Sec
40 Sec
Auto
AMI BIOS SETUP
Effect
Will keep USB
devices available
only for EFI
applications.
Enable all the USB
devices
Disables this
function
Enables this
function
Disables this
function
Enables this
function
Depends on the
time‐out value
Depends on the
time‐out value
Uses default value:
for a root port it is
100 ms, for a Hub
port the delay is
taken from Hub
descriptor
63
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